Income Taxes - Activity related to the Company’s unrecognized tax benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 1,217	$ 5,767	$ 6,117
Increases related to current year tax positions	0	0	198
Unrecognized Tax Benefits, Increases Resulting from Acquisition	236	0	0
Increases related to previous year tax positions	580	395	79
Reductions due to lapse of applicable statute of limitations	(256)	(4,945)	(627)
Reduction due to settlements	(699)	0	0
Balance at December 31	$ 1,078	$ 1,217	$ 5,767